Securing device.



C. H. MURRELL.

SECURING DEVICE. APPLICATION FILED .IAN.20. I917- Patented Apr. 30,1918.

avwamtoz UNITED STATES PATENT OFFICE.

CLIFFORD H. IbflI'U'RlR/ELIJ, 0F ROANOKE, VIRGINIA, ASSIGNOR TO MURRELLFASTENER SECURING DEVICE.

Specification of Letters Patent.

Patented Apr. 30, 1918.

Application filed January 20, 1917. Serial No. 143,504..

To all whom it may concern:

Be it known that I, CLIFFORD H. MURRELL, a citizen of the United States,residing at Roanoke, in the county of Roanoke and State of Virginia,have invented certain new and useful Improvements in Securing Devices,of which the following is a specification.

This invention relates to an improved method of securing articles suchas electric insulators or the like to thin walls of metal such as metalceilings, and includes a specially formed coil of wire by which the saidmethod is put into use. The primary object of the invention is tosimplify the task of applying exposed electric wires.

The invention consists of the novel features of construction andmanipulation as will be herein set forth and claimed.

Inthe drawings, Figure 1 is aside elevational View of the coiled wire ofmy invention and Fig. 2 a vertical sectional view showing an insulatorapplied to a metal ceiling in accordance with my improved method.

In these drawings, 1 represents a metal ceiling and 2 a commercialporcelain insulator made to receive and hold the wire 3. These arecommonly secured to wood work by means of wood screws. In theapplication of these as I practice it I employ a sim1-- lar threadedmember or wood screw 4. The thin ceiling plate 3 is first pierced at 5by means of a punch or nail set, the hole formed being preferablyslightly larger than the body of the screw 4. I then provide a wire coil6 which is formed substantially as a tapered helix. The smallend of thiscoil is entered axially in this hole 5 as far as the tapered sides ofthe coil will admit and is then rotated axially so as to thread allexcept a small amount (in practice, about one turn) of the, wire coilthrough the metal The large end of the coil being Somewhat greater indiameter than the body of the screw or than the pierced hole, it will beseen that the coiled w1re now overlies the metal around the hole. Thescrew 4 is then passed througli the insulator andthe threaded endinserted through the hole and up inside of the coil. The screw is .thenrotated ceiling.

in the usual manner and as it is turned the wire coils' adapt themselvesin both diameter and pitch to the threads of the screw and form ineffect a nut. As the screw is rotated the coils travel down the threadsand pack together above the metal ceiling late, at the same timeexpanding, and the Insulator is firmly clamped thereto with the sameefiectas though the screws were driven into wood;

Thus I have described the article of my invention and its use, and itssimplicity, strength and practicability will be evident -to mechanics.and those familiar with such arts.

What I claim is:

1. In a securing device, a section of wire wound substantially into theform of a tapered helix, small at one end and larger at the other end,and in combination therewith an externally screw -threaded member, the

helix being at thesmall end of such diam- 'et er that the wire will fallwithin, conform themselves to and engage the threads of the threadedmember, and being of such diameter at the larger end that the coils willthreaded member.

3. In a securing device, a thin metal plate having a pierced holetherein, a screw extending through the article to be secured and throughthe thin plate, a section of w1re coiled into the form of a taperedhelix, the

one end being of such diameter as to snugly fit. into the threads of thesaid. screw and also to pass axially through the said ierced hole, thelarger end being of such diameter as will not pass' axially through thesaid hole.

' In testimon whereof I aflix my signature .in presence 0 two witnesses.CLIFFORD H. MURRELL. Witneses:

R. F. Downy,- ALLEN F. FERRELL.

